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Build U-Boot from source code

Toolchain installation for out of builds

To install the toolchain, follow the Debian Flexbuild Toolchain installation guide.

Build U-Boot out of tree

Obtain sources:

$ git clone https://github.com/varigit/uboot-imx.git -b lf_v2024.04_6.6.52-2.2.0_var01
$ cd uboot-imx

Configure compilation environment:

$ export ARCH=arm
$ export CROSS_COMPILE=arm-linux-gnueabihf-

Cleanup everything:

$ make mrproper

Select configuration:

For booting from SD card/eMMC:
$ make imx6ul_var_dart_mmc_defconfig

Build U-Boot:

$ make -j$(nproc)

Install the built U-Boot on an SD card

$ sudo dd if=u-boot-with-spl.imx of=/dev/sdX bs=1K seek=1; sync

(Replace /dev/sdX with the correct device)

If you want to use our recovery SD card to flash the built U-Boot to eMMC, then copy it to the appropriate location in the SD card:

$ sudo cp u-boot-with-spl.imx /media/rootfs/opt/images/Debian

And eject the SD card gracefully from host machine.

Note: If you manually upgrade an existing U-Boot, and you have an old environment saved, it is a good idea to reset your environment to the new default.)

Update your U-Boot out of Debian tree

$ git pull